JPH067863A - Honeycomb structure and manufacture of honeycomb panel and curved surface honeycomb panel - Google Patents

Abstract

PURPOSE:To provide a curved surface honeycomb panel in which a continuous nonsupporting areas are eliminated and rigidity and strength are improved. CONSTITUTION:On a quadratic surfaced lower face plate 112, a honeycomb core member 114 and a reinforcing core member 116 are alternately placed side by side, and an upper face plate 118 is loaded on the honeycomb core member 114 and the reinforcing core member 116. Then, the lower face plate 112, upper face plate 118, honeycomb core member 114 and reinforcing core member 116 are brazed. A curved surface honeycomb panel 100 is obtained which is structured with the reinforcing core member 116 inserted between the adjacent honeycomb core members 114. On the side of the convexed upper face plate 118, the face plate 118 is supported by the reinforcing core member 116 between the honeycomb core members 114 that the not joined each other.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a honeycomb structure, a honeycomb panel and a method for manufacturing a curved honeycomb panel.

[0002]

2. Description of the Related Art Conventionally, there is known a honeycomb panel in which a plurality of honeycomb cores are juxtaposed to densely form honeycomb cells having a regular hexagonal shape or a rectangular shape in cross section, and the front and back surfaces thereof are covered with face plates. Honeycomb panels are flat or curved depending on the purpose and location of use,
Various means are known for obtaining a honeycomb panel having these shapes.

In particular, as a method for obtaining a curved honeycomb panel, (1) a method of bending a flat plate-shaped honeycomb panel to form a curved surface, and (2) a honeycomb having a special shape that is easily deformed along a curved surface A method is known in which a core is sandwiched between curved face plates to obtain a curved honeycomb panel.

The above (1) is the easiest method,
If the curvature becomes large, problems such as buckling of the honeycomb core occur, so that it is difficult to obtain a honeycomb panel having a large curvature. Further, it is difficult to change the curvature in a wave shape, for example, and the degree of freedom in bending is low. In (2), there are problems that the manufacture of the honeycomb core members and the joining of the honeycomb core members are complicated, and that the manufacture of the honeycomb core members becomes difficult when the cell size increases.

In order to solve the above problems in these techniques, (3) the honeycomb core members are juxtaposed on the first face plate having a two-dimensional curved surface along the direction perpendicular to the curvature, and then juxtaposed. A method has been proposed in which a curved second face plate that matches the first face plate is placed on the honeycomb core member, and the honeycomb core member and the face plate are joined. An example of a curved honeycomb panel manufactured by this method is shown in FIG.

However, in the method (3), a portion where the adjacent honeycomb core members 310 are not joined is formed on the convex side of the curved honeycomb panel 300. Therefore, a region where the face plate 330 is not supported by the honeycomb core member 310 (hereinafter, referred to as a non-support region, hatched in the drawing) is continuously formed along the longitudinal direction of the honeycomb core member 310.

This unsupported region partially becomes a portion where the strength of the honeycomb panel is inferior, and when stress such as repeated bending load is applied along the direction intersecting the unsupported region, the face plate 330 of the unsupported region is formed. Even if it does not break, or even if it does not break, the rigidity of the curved honeycomb panel 300 may decrease due to the elastic deformation of the face plate 330 and the honeycomb core member 310.

[0008]

Therefore, the present invention improves the method (3) described above to eliminate the continuous non-supporting area,
An object of the present invention is to provide a curved honeycomb panel that does not cause a partial reduction in rigidity and strength and a method for manufacturing the same. Another object is to provide a honeycomb structure having improved rigidity and strength.

[0009]

The present invention adopts the following constitution as means for solving the above problems. That is,
A honeycomb structure according to a first aspect of the present invention is a honeycomb structure in which a plurality of honeycomb core members having concave and convex portions are arranged in close proximity to each other to form honeycomb cells having a shape corresponding to the shape of the concave and convex portions. A reinforcing core member is provided between the adjacent honeycomb core members.

A honeycomb panel according to a second aspect of the present invention is the first aspect.
A pair of face plates arranged substantially orthogonal to the axial direction of the honeycomb cells is provided on the front surface and the back surface of the honeycomb structure of the invention. Further, according to a third aspect of the present invention, there is provided a method for manufacturing a curved honeycomb panel, wherein a forming die formed into a quadric surface having a linear shape in one direction out of two orthogonal directions and a curved shape in the other direction is flat plate or pre-formed. First molded on the next curved surface
The face plate is placed, and the first face plate has a shape along the quadric surface of the molding die, and a plurality of honeycomb core members having a predetermined shape are mutually positioned on the first face plate, And,
While juxtaposed along the linear direction of the curved surface of the first face plate, a reinforcing core member is arranged between the adjacent honeycomb core members, and a flat surface or a quadric surface corresponding to the curved surface shape of the first face plate in advance is formed. After the molded second face plate is placed on the honeycomb core member and the reinforcing core member, the first face plate, the honeycomb core member, the reinforcing core member and the second face plate are attached to the first and second face plates. The pressure is applied from the outside, and the first and second face plates are joined to the honeycomb core member and the reinforcing core member.

[0011]

According to the honeycomb structure of the first invention, since the reinforcing core member is provided between the adjacent honeycomb core members, the strength is improved. Therefore, high load resistance can be obtained without reducing the cell size to increase the honeycomb cell density or increasing the plate thickness of the honeycomb core member.

In the honeycomb panel of the second invention, since the honeycomb structure of the first invention is the honeycomb core,
Has excellent load resistance. In particular, in the case of using a quadric curved face plate, even if an unsupported region is formed on the face plate by causing a portion where adjacent honeycomb core members are not joined on the convex side, it is provided between adjacent honeycomb core members. Since the reinforcing core member supports the non-support region, the strength reduction of the non-support region is prevented. Therefore, even if stress such as repeated bending load is applied along the direction intersecting the non-support region, the face plate in the non-support region does not break. Further, it is possible to prevent the rigidity of the honeycomb panel from being lowered due to the elastic deformation of the face plate and the honeycomb core.

Further, according to the method for manufacturing a curved honeycomb panel of the third aspect of the invention, first, a flat plate or a first face plate which has been previously molded into a quadric surface is placed on a molding die molded into a quadric surface and molded. Since the shape follows the quadric surface of the mold,
An accurate quadratic surface can be added to the face plate.

Since the honeycomb core members are positioned side by side with each other on the first face plate placed on the molding die and the reinforcing core members are arranged between the adjacent honeycomb core members, the honeycomb core member and the reinforcing member are reinforced. Arrangement of the core member is easy. Moreover, since the first face plate is placed on the molding die, the first face plate is not deformed during the work of disposing the honeycomb core member and the reinforcing core member.

Since the second face plate formed into a flat plate or a quadric surface is placed on the honeycomb core member and the reinforcing core member, the first face plate, the honeycomb core member, the reinforcing core member and the second face plate are positioned relative to each other. While holding exactly
It has a laminated structure corresponding to the curved surface of the molding die.

After forming the laminated structure, pressure is applied from the outside of the first and second face plates, and the first and second face plates are pressed.
The face plate and the honeycomb core member and the reinforcing core member are joined to obtain a curved honeycomb panel. In the curved honeycomb panel thus obtained, a portion where the adjacent honeycomb core members are not joined on the second face plate side is generated,
Even if the non-supporting region is formed on the face plate, since the reinforcing core member provided between the adjacent honeycomb core members supports the non-supporting region, the strength reduction of the non-supporting region is prevented. Therefore, even if stress such as repeated bending load is applied along the direction intersecting the non-support region, the face plate in the non-support region does not break. Further, it is possible to prevent the rigidity of the curved honeycomb panel from being deteriorated due to the elastic deformation of the face plate and the honeycomb core.

[0017]

The first to third inventions will be described in detail below with reference to the preferred embodiments. (Example 1) The honeycomb structure 10 shown in Fig. 1 has a shape in which honeycomb core members 11 and reinforcing core members 13 are alternately laminated.

The honeycomb core member 11 has trapezoidal concave and convex portions 11a and 11b. The lengths of the sides of the uneven portions 11a and 11b are equal to each other, and the uneven portions 11a and 11b of the adjacent honeycomb core members 11 are opposed to each other to form a hexagonal honeycomb cell 15. The reinforcing core member 13 is composed of a flat plate portion 13a and a corrugated portion 13b. The reinforcing core members 13 are joined to each other while being sandwiched between the pair of honeycomb core members 11 so that the corrugated portions 13b are housed in the honeycomb cells 15.

The hexagonal honeycomb cells 15 are closely connected to each other, and the reinforcing core member 13 is provided in the honeycomb cells 15.
Since the corrugated portion 13b is stored, it has excellent load resistance. In particular, it has excellent load resistance against a load from the honeycomb cell 15 in the axial direction.

It is also possible to reduce the weight of the reinforcing core member 13 by providing an opening in the flat plate portion 13a. FIG. 2 shows an example in which a hole 17 is provided in the flat plate portion 13a of the reinforcing core member 13. 3 shows an example in which the flat plate portion 13a of the reinforcing core member 13 is provided with a gate-shaped notch 19. Hole 1 in flat plate portion 13a
Even if the cutouts 7 and the cutouts 19 are formed, the load resistance of the honeycomb structure 10 is hardly reduced. (Example 2) As shown in FIG. 4, the honeycomb core member 21 of the honeycomb structure 20 has trapezoidal concave-convex portions 21a and 21a.
Hexagonal honeycomb cells 25 having a hexagonal shape and having the concave and convex portions 21a and 21b of the adjacent honeycomb core members 21 arranged opposite to each other.
Is formed.

A reinforcing core member 27 is inserted between the adjacent honeycomb core members 21, and the two are joined to each other. In the reinforcing core member 27, flat plate portions 29 and corrugated portions 31 are alternately provided. The length of the flat plate portion 29 is the uneven portion 2
It corresponds to the length of one side of 1a and 21b.

The corrugated portion 31 has two short hypotenuse portions 31a,
It is composed of one long hypotenuse part 31b and two top parts 31c. The short hypotenuse part 31a and the top part 31c have the same length, and the long hypotenuse part is twice as long. The distance between the two short hypotenuse portions 31a is the honeycomb cell 2
It is slightly shorter than the distance between the opposite sides of 5, and the short hypotenuse part 31
a and the pair of opposite sides of the honeycomb cell 25 in contact with a are in close contact with each other.

Since the corrugated portion 31 has the above-mentioned shape, during the assembling work for manufacturing the honeycomb structure 20,
The relative position between the honeycomb cell 25 and the corrugated portion 31 is easily determined. Therefore, the relative positions of the honeycomb core member 21 and the reinforcing core member 27 are easily determined, so that the workability during assembly is improved.

The hexagonal honeycomb cells 25 are closely connected to each other, and the reinforcing core member 27 is provided inside the honeycomb cells 25.
Since the corrugated part 31 is stored, it has excellent load resistance. In particular, it has excellent load resistance against the load from the axial direction of the honeycomb cells 25. It should be noted that the reinforcing core member 27 is not made to be a series, but only a portion corresponding to, for example, the corrugated portion 31, is provided in each honeycomb cell 25.
It may have a structure in which individual pieces are inserted. By doing this, after the honeycomb core member 21 is assembled, the reinforcing core member can be inserted into each honeycomb cell 25 to assemble the honeycomb structure 20, so that the honeycomb core member 21 and the reinforcing core member in the assembling work can be combined. Positioning is virtually unnecessary and workability is improved. (Embodiment 3) Next, with reference to FIGS. 5 to 7, an example of manufacturing the curved honeycomb panel 100 according to the third invention will be described.

In FIG. 5, a lower surface plate 112 of an aluminum alloy having one surface clad with a brazing material is placed on a molding die 110 having a quadric curved surface for mounting in the direction of arrow W. Place with the top up. Since the mounting surface provided on the molding die 110 has a large radius of curvature, the lower side surface plate 112 bends under its own weight to form a curved surface according to the shape of the mounting surface of the molding die 110. The lower side surface plate 112 may be preliminarily formed into a quadric surface shape according to the forming die 110.

Next, on the lower side plate 112, a honeycomb core member 114 and a reinforcing core member 116 of aluminum alloy, both of which are clad with a brazing material, are arranged so as to be substantially orthogonal to the lower side plate 112, with the arrow L direction being the longitudinal direction. Alternately. Honeycomb core member 114 and reinforcing core member 1
16 has the same shape as that described in the second embodiment.
Although only a part thereof is shown in FIG. 5, the honeycomb core member 114 and the reinforcing core member 116 are not shown in the lower side surface plate 112.
A plurality of sheets are juxtaposed so as to satisfy the width in the arrow W direction. The lengths of the honeycomb core member 114 and the reinforcing core member 116 depend on the length of the lower side surface plate 112 in the arrow L direction.

The honeycomb core member 11 is on the lower side plate 112.
After being filled with 4 and the reinforcing core member 116, the upper side plate 118 of the aluminum alloy clad with the brazing material is placed on the honeycomb core member 114 and the reinforcing core member 116 with the clad side facing down. Similarly to the lower side surface plate 112, the upper side surface plate 118 is bent by its own weight to bend the honeycomb core member 1.
14 and the edge of the reinforcing core member 116 has a shape corresponding to the pseudo curved surface. The upper side surface plate 118 may be preliminarily formed into a quadric surface shape.

Thereafter, the upper side surface plate 118 is covered with a jig, and the lower side surface plate 112, the upper side surface plate 118, the honeycomb core member 114, and the reinforcing core member 116 are pressed and heated by the jig and the molding die 110. By the heating, the lower side plate 112, the upper side plate 118, the honeycomb core member 114
And the brazing material clad in the reinforcing core member 116 is melted and flows into the gap between the contact portions of the respective persons. When the brazing material is solidified in this state by cooling, the lower side surface plate 11
2, the upper side surface plate 118, the honeycomb core member 114, and the reinforcing core member 116 are joined to each other at their contact portions. Thus, the curved honeycomb panel 100 is obtained.

In this curved honeycomb panel 100, an unsupported region where the honeycomb core members 114 are not joined to each other is formed on the upper side surface plate 118 side, but since the reinforcing core member 116 is provided between the adjacent honeycomb core members 114,
The unsupported region is divided by the reinforcing core member 116.

Therefore, the curved honeycomb panel 100 does not have a portion of low rigidity and low strength due to the continuous non-support regions. In addition, the reinforcing core member 11
Since 6 functions as a support as in the honeycomb core member 114, the curved honeycomb panel 100 has excellent load resistance.

Since the strength of the curved honeycomb panel 100 is substantially improved by providing the reinforcing core member 116, it is possible to increase the size of the honeycomb cell or thin the honeycomb core member 114 and the reinforcing core member 116. It is possible. The reinforcing core member 116 has a structure shown in FIGS.
Further weight reduction can be achieved by providing holes and notches as in the example shown in FIG. Further, when the notch is provided, the distance between the honeycomb core members 114 can be shortened as shown in FIG. 3B, so that the width of the non-support region is narrowed and the panel strength of this portion is improved.

Further, as shown in FIG. 8, the reinforcing core members 116 may be provided between the adjacent honeycomb core members 114 along the direction intersecting the longitudinal direction of the honeycomb core members 114. In this way, each reinforcing core member 11
Since the non-support region is finely divided by 6, the strength of the curved honeycomb panel 100 is improved.

Further, according to the method of the present invention, the mold 11
Since the curved honeycomb panel 100 corresponding to the curved shape of 0 can be obtained, standardization becomes possible. Although three examples have been described above, the materials of the honeycomb core member and the face plate used in the first to third inventions are not particularly limited,
For example, metals such as aluminum and aluminum alloys, plastics, and laminated materials can be used.

The shape of the honeycomb core member is not particularly limited. For example, a honeycomb core member having a trapezoidal concave-convex shape to form a hexagonal honeycomb cell with an adjacent honeycomb core member, or a rectangular concave-convex shape. When the honeycomb cell has a shape of forming a rectangular honeycomb cell, it is easy to mold the honeycomb core and dispose it on the face plate.

The material of the reinforcing core member is not particularly limited,
For example, similar to the above honeycomb core member or face plate, metal such as aluminum or aluminum alloy, plastic,
A laminated material or the like can be used. When brazing using a metal such as aluminum or aluminum alloy, the reinforcing core member may be a bare material as long as the honeycomb core member and the face plate are clad with the brazing material.

The reinforcing core member may have a corrugated portion or a flat plate shape, and is not particularly limited as long as it can be installed between the honeycomb core members. Various types can be adopted, such as an integral type in which a plurality of honeycomb cells are connected in the longitudinal direction, a type in which each honeycomb cell or a bonded portion of adjacent honeycomb core members is separately installed in a plurality of portions.

The honeycomb core member, the face plate and the reinforcing core member do not have to be made of the same material, and it is possible to combine appropriate materials depending on the application of the honeycomb panel. Of course, the above two or three can be made of the same material. The means for joining these three members is not particularly limited. In addition to the brazing shown in the examples, a method using an adhesive or mechanical "caulking" can be adopted.

[0038]

As described above, the curved honeycomb panel of the present invention does not have a continuous non-support region, and does not cause partial reduction in rigidity and strength. Moreover, the honeycomb structure of the present invention has high rigidity and strength. By using this honeycomb structure, it is possible to obtain a honeycomb panel having excellent load resistance.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a honeycomb structure of Example 1.

FIG. 2 is an explanatory diagram of an example in which holes are formed in the reinforcing core member of the honeycomb structure of Example 1.

FIG. 3 is an explanatory diagram of an example in which a notch is formed in the reinforcing core member of the honeycomb structure of Example 1.

FIG. 4 is an explanatory view of a honeycomb structure of Example 2.

FIG. 5 is an explanatory diagram of a structure of a curved honeycomb panel of Example 3.

FIG. 6 is a cross-sectional view of a honeycomb cell portion of a curved honeycomb panel of Example 3.

FIG. 7 is a cross-sectional view of a joint portion between a honeycomb core member and a reinforcing core member of the curved honeycomb panel of Example 3.

FIG. 8 is an explanatory diagram of an example in which a reinforcing core member is provided along a direction intersecting the longitudinal direction of the honeycomb core member.

[Fig. 9] Fig. 9 is an explanatory diagram of a conventional curved honeycomb panel.

[Explanation of symbols]

10, 20 ... Honeycomb structure, 11, 21 ... Honeycomb core member, 13, 27 ... Reinforcing core member, 13
b, 31 ... Corrugated part, 15, 25 ... Honeycomb cell, 100 ... Curved honeycomb panel, 110 ... Mold, 112 ... Lower side plate, 114 ... Honeycomb core member, 116 ... Reinforcing core member, 118 ... Upper side plate.

Claims (7)

[Claims] 1. A honeycomb structure in which a plurality of honeycomb core members each having a concave-convex portion are arranged close to each other to form a honeycomb cell having a shape corresponding to the shape of the concave-convex portion, the honeycomb core members being adjacent to each other. A honeycomb structure having a reinforcing core member provided therebetween. 2. The reinforcing core member is provided along the longitudinal direction of the honeycomb core member.
The described honeycomb structure. 3. The honeycomb structure according to claim 1, wherein the reinforcing core member is provided along a direction intersecting a longitudinal direction of the honeycomb core member. 4. The honeycomb structure according to any one of claims 1 to 3, wherein the reinforcing core member is provided with a corrugated portion. 5. A honeycomb panel, comprising a pair of face plates arranged substantially orthogonal to the axial direction of the honeycomb cells on the front surface and the back surface of the honeycomb structure according to any one of claims 1 to 4. . 6. The pair of face plates is a pair of face plates having a quadric surface in which one of two orthogonal directions has a linear shape and the other direction has a curved shape. Honeycomb panel. 7. A flat plate or a first face plate preliminarily molded into a quadric surface is formed on a molding die which is molded into a quadric surface in which one of the two orthogonal directions is linear and the other is curved. Place the first face plate in a shape along the quadric surface of the molding die, and position a plurality of honeycomb core members of a predetermined shape on the first face plate with respect to each other, and The juxtaposed side-by-side along the straight line direction of the curved surface of the first face plate, the reinforcing core member is arranged between the adjacent honeycomb core members, and formed into a flat plate or a quadric surface corresponding to the curved surface shape of the first face plate in advance. The second face plate is placed on the honeycomb core member and the reinforcing core member, and then the first face plate, the honeycomb core member, the reinforcing core member, and the second face plate are placed outside the first and second face plates. From the first and second A method for manufacturing a curved honeycomb panel, which comprises bonding a face plate to the honeycomb core member and the reinforcing core member.